HARRISON TOWNSHIP, MI -- A lock-down and grounding of flights was ordered at Selfridge Air National Guard Base in suburban Detroit after a dead body was discovered on the grounds about 9 a.m.

127th Wing spokesman Technical Sgt. Dan Heaton says the lock-down was lifted shortly after and flights had resumed as of noon.

"The body of the individual was discovered on the west side of the base, outside of a base building," Heaton said. "The discovery was made by a military member who immediately contacted base security and fire personnel. No identification was found on the body."

State police are investigating.

"The subject appeared to have jumped the fence leading from a swampy area onto the base," state police said in a statement. "The subject is unidentified at this time, however he is not an employee of the base."

The victim is a white male between 20 and 30 years old, slim, about 5-feet, 9-inches tall with short sandy-blonde hair.

He had on jeans, boots and a Red Wings sweatshirt with no ID.

He was discovered on the west side of the base where 1,700 guardsmen are stationed.